linux-kernel - Re: [PATCH v6 00/52] Introduce memory interconnect for NVIDIA Tegra SoCs

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Date:   Tue, 27 Oct 2020 09:52:53 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Chanwoo Choi <cw00.choi@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Viresh Kumar <vireshk@...nel.org>,
        Peter Geis <pgwipeout@...il.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        linux-tegra@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 00/52] Introduce memory interconnect for NVIDIA Tegra
 SoCs

On Mon, Oct 26, 2020 at 10:14:10PM +0300, Dmitry Osipenko wrote:
> 26.10.2020 18:08, Krzysztof Kozlowski пишет:
> > On Mon, Oct 26, 2020 at 01:16:43AM +0300, Dmitry Osipenko wrote:
> >> Hello,
> >>
> >> This series brings initial support for memory interconnect to Tegra20,
> >> Tegra30 and Tegra124 SoCs.
> >>
> >> For the starter only display controllers and devfreq devices are getting
> >> interconnect API support, others could be supported later on. The display
> >> controllers have the biggest demand for interconnect API right now because
> >> dynamic memory frequency scaling can't be done safely without taking into
> >> account bandwidth requirement from the displays. In particular this series
> >> fixes distorted display output on T30 Ouya and T124 TK1 devices.
> > 
> > Hi,
> > 
> > You introduced in v6 multiple new patches. Could you describe the
> > dependencies, if any?
> 
> Hello,
> 
> The v6 dropped some older patches and replaced them with the new
> patches. Previously I wanted to postpone the more complex changes for
> later times, like supporting OPP tables and DVFS, but then the review
> started to take more time than was expected and there was enough time to
> complete those features.
> 
> There are five basic sets of patches:
> 
> 	1. DT bindings
> 	2. DT changes
> 	3. SoC, clk and memory
> 	4. devfreq
> 	5. DRM
> 
> Each set could be applied separately.
> 
> Memory patches have a build dependency on the SoC and clk patches.
> 
> The "tegra-mc: Add interconnect framework" and "Add and use
> devm_tegra_get_memory_controller()" are the root build dependencies for
> all memory/ patches. Other patches are grouped per SoC generation
> (Tegra20/30/124), patches within a SoC-gen group are interdependent.
> 
> I suppose the best variant would be to merge the whole series via
> tegra-tree in order to preserve logical order of the patches. Although,
> merging each set of patches separately also should be okay to do.

Thanks for explanation. I already have three patches for Tegra MC (and
probably two more will be respun) so this might be conflict-prone. The
easiest in such case is to provide me soc and clk patches on the branch,
so I could keep all Tegra MC together.

Best regards,
Krzysztof